From bb7e7aeb3d832059e33b1e76eb85d4680f77abf2 Mon Sep 17 00:00:00 2001
From: Ben Hutchings <ben@decadent.org.uk>
Date: Fri, 3 Jun 2016 01:08:36 +0100
Subject: [PATCH] phram: Use memremap() to allow mapping of system RAM
Using memremap() instead of ioremap() allows mapping a disk image in
system RAM that has somehow been reserved. It should fall back
to ioremap() where necessary.
Entirely untested, and I'm not convinced this is a good idea at all.
---
drivers/mtd/devices/phram.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)
diff --git a/drivers/mtd/devices/phram.c b/drivers/mtd/devices/phram.c
index 8b66e52ca3cc..0ea254e2ba51 100644
--- a/drivers/mtd/devices/phram.c
+++ b/drivers/mtd/devices/phram.c
@@ -88,7 +88,7 @@ static void unregister_devices(void)
list_for_each_entry_safe(this, safe, &phram_list, list) {
mtd_device_unregister(&this->mtd);
- iounmap(this->mtd.priv);
+ memunmap(this->mtd.priv);
kfree(this->mtd.name);
kfree(this);
}
@@ -104,7 +104,8 @@ static int register_device(char *name, phys_addr_t start, size_t len)
goto out0;
ret = -EIO;
- new->mtd.priv = ioremap(start, len);
+ new->mtd.priv = memremap(start, len,
+ MEMREMAP_WB | MEMREMAP_WT | MEMREMAP_WC);
if (!new->mtd.priv) {
pr_err("ioremap failed\n");
goto out1;
@@ -134,7 +135,7 @@ static int register_device(char *name, phys_addr_t start, size_t len)
return 0;
out2:
- iounmap(new->mtd.priv);
+ memunmap(new->mtd.priv);
out1:
kfree(new);
out0: